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Add hooks for expression fragments and visitors
Creates Npgsql implementations of `IExpressionFragmentTranslator` and `IQueryOptimizer` to support more complex translations. These classes make it easier to inject new fragment translations and expression rewrites into the EF Core translation process. This is split out from #431. Working examples can be found there.
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...re.PG/Query/ExpressionTranslators/Internal/NpgsqlCompositeExpressionFragmentTranslator.cs
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#region License | ||
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// The PostgreSQL License | ||
// | ||
// Copyright (C) 2016 The Npgsql Development Team | ||
// | ||
// Permission to use, copy, modify, and distribute this software and its | ||
// documentation for any purpose, without fee, and without a written | ||
// agreement is hereby granted, provided that the above copyright notice | ||
// and this paragraph and the following two paragraphs appear in all copies. | ||
// | ||
// IN NO EVENT SHALL THE NPGSQL DEVELOPMENT TEAM BE LIABLE TO ANY PARTY | ||
// FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, | ||
// INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS | ||
// DOCUMENTATION, EVEN IF THE NPGSQL DEVELOPMENT TEAM HAS BEEN ADVISED OF | ||
// THE POSSIBILITY OF SUCH DAMAGE. | ||
// | ||
// THE NPGSQL DEVELOPMENT TEAM SPECIFICALLY DISCLAIMS ANY WARRANTIES, | ||
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY | ||
// AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS | ||
// ON AN "AS IS" BASIS, AND THE NPGSQL DEVELOPMENT TEAM HAS NO OBLIGATIONS | ||
// TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. | ||
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#endregion | ||
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using System.Collections.Generic; | ||
using JetBrains.Annotations; | ||
using Microsoft.EntityFrameworkCore.Query.ExpressionTranslators; | ||
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namespace Npgsql.EntityFrameworkCore.PostgreSQL.Query.ExpressionTranslators.Internal | ||
{ | ||
/// <summary> | ||
/// A composite expression fragment translator that dispatches to multiple specialized translators specific to Npgsql. | ||
/// </summary> | ||
public class NpgsqlCompositeExpressionFragmentTranslator : RelationalCompositeExpressionFragmentTranslator | ||
{ | ||
/// <summary> | ||
/// The default expression fragment translators registered by the Npgsql provider. | ||
/// </summary> | ||
[NotNull] [ItemNotNull] static readonly IExpressionFragmentTranslator[] ExpressionFragmentTranslators = {}; | ||
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/// <inheritdoc /> | ||
public NpgsqlCompositeExpressionFragmentTranslator( | ||
[NotNull] RelationalCompositeExpressionFragmentTranslatorDependencies dependencies) | ||
: base(dependencies) | ||
{ | ||
// ReSharper disable once DoNotCallOverridableMethodsInConstructor | ||
AddTranslators(ExpressionFragmentTranslators); | ||
} | ||
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/// <summary> | ||
/// Adds additional dispatches to the translators list. | ||
/// </summary> | ||
/// <param name="translators">The translators.</param> | ||
public new virtual void AddTranslators([NotNull] IEnumerable<IExpressionFragmentTranslator> translators) | ||
=> base.AddTranslators(translators); | ||
} | ||
} |
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#region License | ||
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// The PostgreSQL License | ||
// | ||
// Copyright (C) 2016 The Npgsql Development Team | ||
// | ||
// Permission to use, copy, modify, and distribute this software and its | ||
// documentation for any purpose, without fee, and without a written | ||
// agreement is hereby granted, provided that the above copyright notice | ||
// and this paragraph and the following two paragraphs appear in all copies. | ||
// | ||
// IN NO EVENT SHALL THE NPGSQL DEVELOPMENT TEAM BE LIABLE TO ANY PARTY | ||
// FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, | ||
// INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS | ||
// DOCUMENTATION, EVEN IF THE NPGSQL DEVELOPMENT TEAM HAS BEEN ADVISED OF | ||
// THE POSSIBILITY OF SUCH DAMAGE. | ||
// | ||
// THE NPGSQL DEVELOPMENT TEAM SPECIFICALLY DISCLAIMS ANY WARRANTIES, | ||
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY | ||
// AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS | ||
// ON AN "AS IS" BASIS, AND THE NPGSQL DEVELOPMENT TEAM HAS NO OBLIGATIONS | ||
// TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. | ||
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#endregion | ||
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using System.Linq.Expressions; | ||
using JetBrains.Annotations; | ||
using Microsoft.EntityFrameworkCore.Query; | ||
using Microsoft.EntityFrameworkCore.Query.Internal; | ||
using Remotion.Linq; | ||
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namespace Npgsql.EntityFrameworkCore.PostgreSQL.Query.Internal | ||
{ | ||
/// <summary> | ||
/// The default relational LINQ query optimizer for Npgsql. | ||
/// </summary> | ||
public class NpgsqlQueryOptimizer : QueryOptimizer | ||
{ | ||
/// <summary> | ||
/// The default expression visitors registered by the Npgsql provider. | ||
/// </summary> | ||
[NotNull] [ItemNotNull] static readonly ExpressionVisitor[] ExpressionVisitors = {}; | ||
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/// <inheritdoc /> | ||
public override void Optimize(QueryCompilationContext queryCompilationContext, QueryModel queryModel) | ||
{ | ||
base.Optimize(queryCompilationContext, queryModel); | ||
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for (int i = 0; i < ExpressionVisitors.Length; i++) | ||
{ | ||
queryModel.TransformExpressions(ExpressionVisitors[i].Visit); | ||
} | ||
} | ||
} | ||
} |